Nikon D600 tethered to Capture One Pro 7 issues

I shoot with a Nikon D800E tethered to Capture One Pro 7 with no problem. When I tether a Nikon D600, the software does not recognize the camera, and my info screen on top of the camera flickers. Capture One states that the software supports the D600 tethered.I've swapped out the cable, but the problem persists. Any one else out there shooting tethered to Capture One with a D600 experiencing any issues? Any thoughts on how to resolve the problem?